[PATCH 05/11] drm/amdgpu: fix and cleanup gmc_v8_0_flush_gpu_tlb_pasid

[Shashank Sharma]

On 05/09/2023 08:04, Christian König wrote:
> Testing for reset is pointless since the reset can start right after the
> test. Grab the reset semaphore instead.
>
> The same PASID can be used by more than once VMID, build a mask of VMIDs
> to reset instead of just restting the first one.
>
> Signed-off-by: Christian König <christian.koenig at amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c | 20 ++++++++++----------
>   1 file changed, 10 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
> index 5af235202513..2d51531a1f2d 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
> @@ -31,6 +31,7 @@
>   #include "amdgpu_ucode.h"
>   #include "amdgpu_amdkfd.h"
>   #include "amdgpu_gem.h"
> +#include "amdgpu_reset.h"
>   
>   #include "gmc/gmc_8_1_d.h"
>   #include "gmc/gmc_8_1_sh_mask.h"
> @@ -616,25 +617,24 @@ static int gmc_v8_0_flush_gpu_tlb_pasid(struct amdgpu_device *adev,
>   					uint16_t pasid, uint32_t flush_type,
>   					bool all_hub, uint32_t inst)
>   {
> +	u32 mask = 0x0;
>   	int vmid;
> -	unsigned int tmp;
>   
> -	if (amdgpu_in_reset(adev))
> -		return -EIO;
> +	if(!down_read_trylock(&adev->reset_domain->sem))
> +		return 0;
>   
>   	for (vmid = 1; vmid < 16; vmid++) {
> +		u32 tmp = RREG32(mmATC_VMID0_PASID_MAPPING + vmid);
>   
> -		tmp = RREG32(mmATC_VMID0_PASID_MAPPING + vmid);
>   		if ((tmp & ATC_VMID0_PASID_MAPPING__VALID_MASK) &&
> -			(tmp & ATC_VMID0_PASID_MAPPING__PASID_MASK) == pasid) {
> -			WREG32(mmVM_INVALIDATE_REQUEST, 1 << vmid);
> -			RREG32(mmVM_INVALIDATE_RESPONSE);
> -			break;
> -		}
> +		    (tmp & ATC_VMID0_PASID_MAPPING__PASID_MASK) == pasid)
> +			mask |= 1 << vmid;

Same comment as previous patch, first vmid match vs last vmid match, is 
that intended logic change ?

- Shashank

>   	}
>   
> +	WREG32(mmVM_INVALIDATE_REQUEST, mask);
> +	RREG32(mmVM_INVALIDATE_RESPONSE);
> +	up_read(&adev->reset_domain->sem);
>   	return 0;
> -
>   }
>   
>   /*